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A determination of the characteristics of Cepheids from B-type companions

Published online by Cambridge University Press:  12 April 2016

D.H. McNamara  and
Kent A. Feltz Jr.
D.H. McNamara
Affiliation:
Department of Physics and Astronomy, Brigham Young University
Kent A. Feltz Jr.
Affiliation:
Department of Physics and Astronomy, Brigham Young University

Extract

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Photometry (uvbyβ) of five cepheids with B-type companions has been utilized to derive the spectral types and apparent magnitudes of the companions. By utilizing the period-luminosity relation it is possible to estimate the absolute magnitudes of the companions since the differences in magnitude between the companions and cepheids are known. The spectral types and absolute magnitudes of the B-type components indicate they are all evolved from the zero-age main sequence. By utilizing the ages of the B stars we can derive the ages of the cepheids under the assumptions that both stars of a binary were formed at the same time and the cepheids are more evolved than their B components. A period-age relation of the form log tage = 8.60 - 0.83 log P is found. Minimum masses of the cepheids can also be estimated from the data. No evidence of large mass loss is evident in the intermediate-band photometry of cepheids.

Type
Session VII - Mass Loss and Stellar Evolution: Intermediate Mass Stars
Information
International Astronomical Union Colloquium , Volume 59: Effects of Mass Loss on Stellar Evolution , 1981 , pp. 389 - 395
Copyright
Copyright © Reidel 1981

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